RavenclawDev: returning frame from a back end; with lists
Antoine Raux
antoine at cs.cmu.edu
Fri Oct 13 09:45:39 EDT 2006
Hi Svetlana,
Are you using actual tab characters between slot names and values or spaces?
RavenClaw expect tab characters there (e.g. between "error" and "false",
"results" and ":1", etc). Otherwise I can't see anything strange in your
frame. If that's not it, could you send the exact exception and line number?
antoine
_____
From: ravenclaw-developers-bounces at LOGANBERRY.srv.cs.cmu.edu
[mailto:ravenclaw-developers-bounces at LOGANBERRY.srv.cs.cmu.edu] On Behalf Of
Svetlana Stenchikova
Sent: Friday, October 13, 2006 9:25 AM
To: Dan Bohus
Cc: ravenclaw-developers at cs.cmu.edu
Subject: Re: RavenclawDev: returning frame from a back end; with lists
Mistyped email - sorry -:
String str =
"{\n" +
"error false\n" +
"results :1\n" +
"{\n" +
"{\n" +
"date_time {\n" +
"time {\n" +
" start_time 1700\n" +
" end_time 1800\n" +
"}\n" +
"date {\n" +
" valid_date true\n" +
" year 2006\n" +
" month 10\n" +
" day 11\n" +
" weekday 3\n" +
"}\n" +
"}\n" +
"}\n" +
"}\n" +
"}";
On 10/13/06, Dan Bohus <dbohus at cs.cmu.edu> wrote:
Hi Svetlana,
Hmm, sorry, I'm a bit confused by the beginning of it.
String str = "{\nerror false\n}";
/ "{\n" +
"error false\n" +
Does that compile in java? Or is that just a mistype in the email. O/w I
can't see anything with the naked eye, but you might try setting a
breakpoint right on the line in FrameConcept.cpp where RavenClaw crashes and
see what the problem is. Sorry I can't be more helpful, I hope you'll sort
it out. We should have had this "string frame" format documented somewhere
really well.
-Dan
_____
From: Svetlana Stenchikova [mailto:svetastenchikova at gmail.com]
Sent: Friday, October 13, 2006 12:14 AM
To: Dan Bohus
Cc: ravenclaw-developers at cs.cmu.edu
Subject: Re: RavenclawDev: returning frame from a back end; with lists
Hi,
I am now trying to hard-code a string to return, just for a test:
String str = "{\nerror false\n}";
/ "{\n" +
"error false\n" +
"results :1\n" +
"{\n" +
"{\n" +
"date_time {\n" +
"time {\n" +
" start_time 1700\n" +
" end_time 1800\n" +
"}\n" +
"date {\n" +
" valid_date true\n" +
" year 2006\n" +
" month 10\n" +
" day 11\n" +
" weekday 3\n" +
"}\n" +
"}\n" +
"}\n" +
"}\n" +
"}";
GFrame newframe = new Clause("");
newframe.setProperty(":outframe", str);
and getting exception in FrameConcept.cpp on line 288
Can anyone see a problem with this hard-coded string?
thanks,
Svetlana
On 10/12/06, Svetlana Stenchikova <svetastenchikova at gmail.com> wrote:
OK, it worked after several replacements were done to the string:
GFrame eventAdded = new Clause("");
String strRes = tempFrame.toString();
String newstr1 = strRes.replaceAll("\\{c", "{\n");
String newstr2 = newstr1.replaceAll("\\\"", "");
String newstr = newstr2.replaceAll("\\}", "\n}");
eventAdded.setProperty(":outframe", newstr);
thanks,
Svetlana
On 10/11/06, Dan Bohus < dbohus at cs.cmu.edu <mailto:dbohus at cs.cmu.edu> >
wrote:
Hi Svetlana,
Yes, you should indeed return a GFrame from the java backend server. This
GFrame should contain one string element, called :outframe which contains
the string representation you had below of the desired structure (e.g. like
for instance the RoomLine perl returns it). If you look into the
BackendServer for RoomLine, essentially what that does is take that string
representation and put it in an outframe string slot in a galaxy return
frame.
Hope this helps, but let me know if it doesn't
Dan
_____
From: Svetlana Stenchikova [mailto: svetastenchikova at gmail.com]
Sent: Wednesday, October 11, 2006 3:32 PM
To: Dan Bohus
Cc: ravenclaw-developers at cs.cmu.edu
Subject: Re: RavenclawDev: returning frame from a back end
Do you think it is possible to return a structure from a java back-end in a
format expected by RavenClaw?
If so, could you please recomment how, and if not, could someone point to
the place in RavenClaw that I could modify to work around this issue?
I am sorry to bother you with this question, but we have a demo coming up
and listing the events is one of the essential functionality that we wanted
to show.
Thank you all for your help!
Svetlana
On 10/10/06, Svetlana Stenchikova <svetastenchikova at gmail.com> wrote:
Thanks Dan,
this generally makes sense, but I am not sure how to do this in the java
server.
The operation function in the java galaxy service returns a GFrame.
I can set properties of this frame in any way, but I must return a GFrame, I
think. I tried declaring an operation that returns String and it causes
runtime exception:
java.lang.ClassCastException: java.lang.String
This is how a RoomLine return from a perl back end looks like:
{
suggested_refine none
error false
results :1
{
{
date_time {
time {
start_time 1700
end_time 1800
}
date {
valid_date true
year 2006
month 10
day 11
weekday 3
}
}
room_size 30
room_projector true
room_whiteboard true
room_computer true
room_network true
room_location Wean Hall
room_size_spec large
room_number 4625
}
}
}
And here is how my java back end frame looks like:
Server environment sending frame:
{c java_be.add_event
error "false"
:hub_opaque_data {c admin_info
:reply_requested 1
:session_id "Default"
:tidx 70
:scriptless 1
:timestamp [array: type GAL_FLOAT_64, 1 elements]
:provider_id "[8]"
:invoked_stype "java_be" } }
Please make a suggestion on how to return a string from a java server.
thank you,
Svetlana
On 10/10/06, Dan Bohus <dbohus at cs.cmu.edu > wrote:
Hi Svetlana,
I think this is the same problem with "Ravenclaw frames" and "galaxy frames"
but on the output side. Basically what you're doing in the code below is
constructing a galaxy frame. Instead ravenclaw expects a single string in
that galaxy frame which contains the information in a single string in the
"string Ravenclaw frame" format.
If this message is too cryptic, let me know and I can send you more details,
Dan
_____
From: ravenclaw-developers-bounces at LOGANBERRY.srv.cs.cmu.edu
[mailto:ravenclaw-developers-bounces at LOGANBERRY.srv.cs.cmu.edu
<mailto:ravenclaw-developers-bounces at LOGANBERRY.srv.cs.cmu.edu> ] On Behalf
Of Svetlana Stenchikova
Sent: Tuesday, October 10, 2006 5:41 PM
To: ravenclaw-developers at cs.cmu.edu
Subject: RavenclawDev: returning frame from a back end
Hi,
How should a back-end function of a ravenclaw dialog manager format a
frame?
For example, I am expecting to get a "error" parameter from:
CALL("java_be.add_event <event_add error>backend_error")
backend_error is declared as:
BOOL_SYSTEM_CONCEPT(backend_error)
In the java back-end:
public GFrame serverOpAddEvent(GFrame f) {
...
GFrame eventAdded = new Clause("event_add");
eventAdded.setProperty("error", "false");
return eventAdded;
}
But the backend_error in DM does not get initialized.
Is there a particular way that the return GFrame from the backend server has
to be generated?
Thank you,
Svetlana
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